XProCheck giving 'Error 11' on MacBook Pro running macOS 11.7

I have no idea what command was used. If this is associated with the third party app XProtect from the EclecticLight, then you should contact them for support of their app. Apple will change the behavior of low level system utilities without any notice, so something that worked two years ago may no longer work today.

Lance.scs wrote:

according to the report of Silent Knight (eclectic light company) xpro is not scanning.

Would you pls advise how to check/ investigate this?

Remove the third-party app.

For assistance with removing the third-party app, please contact the app provider.

If you want support for what that app might or might not report, or might mis-report, or for other assistance with whatever undocumented or unsupported or subject-to-change interfaces used by that app, again, please contact the third-party app provider.

For a more complete macOS system reset operation , erase and re-install macOS, and do not migrate and do not re-install any third-party add-on security, add-on anti-malware, “coffee shop” VPN apps, or add-on cleaner apps.

You’re running a third-party tool reporting on undocumented and unsupported internal details of macOS, and these details are subject to change without notice.

For assistance with this and other output from this and other EclecticLight tools, please ask the very knowledgeable author of the tool for their support.